<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>

      <!-- 选择商品分类区域 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择商品分类：</span>
          <!-- 选择商品分类的级联选择框 -->
          <el-cascader :options="catelist" :props="cateProps" v-model="selectedCateKeys" @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- 标签页 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick">
        <!-- 动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini" @click="addDialogVisible = true">动态参数
          </el-button>
          <el-table :data="manyTableData" border stripe>
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable>{{item}}</el-tag>
                <!-- 动态编辑 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue"
                  ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)"
                  @blur="handleInputConfirm(scope.row)">
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag
                </el-button>
              </template>
            </el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 静态属性面板 -->
        <el-tab-pane label="静态属性" name="only">
          <el-button :disabled="isBtnDisabled" type="primary" size="mini" @click="addDialogVisible = true">静态属性
          </el-button>
          <el-table :data="onlyTableData" border stripe>
            <el-table-column type="expand"></el-table-column>
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑
                </el-button>
                <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除
                </el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加动态参数/静态属性 对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数的对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <!-- 添加参数的对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name" ref="input"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
  export default {
    data() {
      return {
        // 商品分类列表
        catelist: [],
        // 级联选择器的配置对象
        cateProps: {
          label: 'cat_name',  //展示的内容
          value: 'cat_id',  //与展示的内容节点对应的value值
          children: 'children', //嵌套的属性名
          expandTrigger: 'hover'  //展开下级菜单方式
        },
        //级联选择器 选中的元素
        selectedCateKeys: [],
        // 当前展示的标签页
        activeName: 'many',  //默认展示动态参数,
        manyTableData: [],  //动态参数
        onlyTableData: [],  //静态属性
        addDialogVisible: false,  //控制添加对话框的显示与隐藏
        // 添加参数的表单数据对象
        addForm: {
          attr_name: ''
        },
        // 添加表单的验证规则对象
        addFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },
        // 控制修改对话框的显示与隐藏
        editDialogVisible: false,
        // 修改的表单数据对象
        editForm: {
        },
        // 修改表单的验证规则对象
        editFormRules: {
          attr_name: [
            { required: true, message: '请输入参数名称', trigger: 'blur' }
          ]
        },

      }
    },
    methods: {
      // 获取所有的商品分类列表
      async getCateList() {
        const { data: res } = await this.$http.get('categories')
        if (res.meta.status !== 200) {
          return this.$message.error('获取商品分类失败！')
        }

        this.catelist = res.data
        // console.log(this.catelist)
      },
      // 级联选择器 的选择事件
      handleChange() {
        this.getParamsData();
      },
      // 标签页点击事件
      handleTabClick() {
        this.getParamsData();
      },
      // 获取第三级分类的 动态参数或静态属性
      async getParamsData() {
        // 只能选中第3级分类
        if (this.selectedCateKeys.length !== 3) {
          this.selectedCateKeys = []
          return
        }
        // 获取第三级分类的 动态参数或静态属性
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          {
            params: { sel: this.activeName }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数列表失败！')
        }

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
          item.inputVisible = false //控制文本框与按钮的切换
          item.inputValue = '' //获取文本框值
        })
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      },
      // 监听添加对话框的关闭事件
      addDialogClosed() {
        this.$refs.addFormRef.resetFields()
      },
      // 点击按钮，添加参数
      addParams() {
        this.$refs.addFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.post(
            `categories/${this.cateId}/attributes`,
            {
              attr_name: this.addForm.attr_name,
              attr_sel: this.activeName
            }
          )

          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败！')
          }

          this.$message.success('添加参数成功！')
          this.addDialogVisible = false
          this.getParamsData()
        })
      },
      // 点击按钮，展示修改的对话框
      async showEditDialog(attr_id) {
        // 查询当前参数的信息
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes/${attr_id}`,
          {
            params: { attr_sel: this.activeName }
          }
        )

        if (res.meta.status !== 200) {
          return this.$message.error('获取参数信息失败！')
        }

        this.editForm = res.data
        this.editDialogVisible = true
      },
      // 重置修改的表单
      editDialogClosed() {
        // this.$refs.input.resetFields();
        this.$refs.editFormRef.resetFields()
      },
      // 点击按钮，修改参数信息
      editParams() {
        this.$refs.editFormRef.validate(async valid => {
          if (!valid) return
          const { data: res } = await this.$http.put(
            `categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
            { attr_name: this.editForm.attr_name, attr_sel: this.activeName }
          )

          if (res.meta.status !== 200) {
            return this.$message.error('修改参数失败！')
          }

          this.$message.success('修改参数成功！')
          this.getParamsData()
          this.editDialogVisible = false
        })
      },
      // 根据Id删除对应的参数项
      async removeParams(attr_id) {
        const confirmResult = await this.$confirm(
          '此操作将永久删除该参数, 是否继续?',
          '提示',
          {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }
        ).catch(err => err)

        // 用户取消了删除的操作
        if (confirmResult !== 'confirm') {
          return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
        const { data: res } = await this.$http.delete(
          `categories/${this.cateId}/attributes/${attr_id}`
        )

        if (res.meta.status !== 200) {
          return this.$message.error('删除参数失败！')
        }

        this.$message.success('删除参数成功！')
        this.getParamsData()
      },
      // 动态编辑标签-文本框
      async handleInputConfirm(row) {
        if (row.inputValue.trim().length === 0) {
          row.inputValue = ''
          row.inputVisible = false
          return
        }
        // 后续操作
        row.attr_vals.push(row.inputVisible.trim())
        row.inputVisible=''
        row.inputVisible = false
        // 发送请求，将数据提交到后台数据库
        // 需要发起请求，保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
          attr_name:row.attr_name,
          attr_sel:row.attr_sel,
          attr_vals:row.attr_vals.join('')
        })
        if(res.meta.status !== 200){
          return this.$message.error('修改参数失败')
        }
        this.$message.success('修改成功')
      },
      // 动态编辑标签-按钮
      showInput(row) {
        row.inputVisible = true;
        // 组件渲染完毕后，执行回调函数的代码
        this.$nextTick(() => {
          this.$refs.saveTagInput.$refs.input.focus()
        })
      }
    },
    created() {
      this.getCateList()
    },
    computed: {
      // 是否禁用btn
      isBtnDisabled() {
        if (this.selectedCateKeys.length !== 3) {
          return true;
        }
        return false;
      },
      // 当前选中的三级分类的Id
      cateId() {
        if (this.selectedCateKeys.length === 3) {
          return this.selectedCateKeys[2]
        }
        return null
      },
      // 修改对话框的标题
      titleText() {
        if (this.activeName == 'many') {
          return '动态参数'
        }
        return '静态属性'
      }
    },
  }
</script>

<style lang="less" scoped>
  .cat_opt {
    margin: 15px 0;
  }

  .el-tag {
    margin: 10px;
  }

  .input-new-tag {
    width: 120px;
  }
</style>